Methods for heat treating thick-walled forgings

Details Methods for heat treating thick-walled forgings Methods for heat treating thick-walled forgings

C - Chemistry, Metallurgy

21

D

C21D 6/00 (2006.01) C22C 38/00 (2006.01)

Patent

CA 2623995

A method for heat treating thick-walled forgings including heating a low alloy steel to an austenitizing temperature, wherein the low alloy steel comprises carbon of about 0.05- 0.2 wt.%, manganese of about 0.3-0.8 wt.%, and nickel of about 0.25-1.0 wt.%. The method further includes quenching the low alloy steel in a quench media, and then tempering the low alloy steel for less than about thirty minutes per inch of critical section thickness plus about two hours.

La présente invention concerne un traitement thermique destiné aux pièces forgées à parois épaisses et consistant en une chauffe à température d'austénitisation d'un acier faiblement allié constitué pour environ 0,05 à 0,5 % de sa masse de carbone, pour 0,3 à 0,5 % de sa masse de manganèse, et pour 0,25 à 1 % de sa masse de nickel. Le traitement se poursuit par un refroidissement de l'acier faiblement allié dans un milieu de refroidissement, puis un revenu de cet acier moins d'environ 30 minutes par pouce d'épaisseur critique de la section augmentées d'environ 2 heures.

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